treevet
Addicted to ArboristSite
Thanks Ekka for such a thoughtful and researched post. I think it is important to note that the TPZ is adjustable in accordance with monitoring.
In passing I found an article about the University of Texas, a campus known for its stately oaks and glorious canopies. In 1863 it is fabled that during the War Between the States an overzealous officer named John Magruder ordered his garrison to march up College Hill and chop down every ancient tree that covered it and use the wood to fortify the capitol. Only 3 trees survived and these are known as the Battle Oaks, left so shade could be found from the oppressing sun for the troops.
Over the decades mistreatments were noted along with natural stresses and strains. There were many advocates and "arborists" to perpetuate the historic trees though.
It was, according to the article that around 1970 a fellow named Mcginnis, tired of a favorite oak that had bore the marks of repeated blows by a delivery truck pitched the idea of the critical root zone/tree protection zone.
One foot in diameter for every inch in the tree's girth. (note that back in that era the root zone was thought to be much smaller in dia. than it is known to be now).
The CRZ quickly caught on and it became the standard for operating procedure in cases where trees and concrete meet. (excerpted from Tim Taliaferro's article "The war of the Trees"
In passing I found an article about the University of Texas, a campus known for its stately oaks and glorious canopies. In 1863 it is fabled that during the War Between the States an overzealous officer named John Magruder ordered his garrison to march up College Hill and chop down every ancient tree that covered it and use the wood to fortify the capitol. Only 3 trees survived and these are known as the Battle Oaks, left so shade could be found from the oppressing sun for the troops.
Over the decades mistreatments were noted along with natural stresses and strains. There were many advocates and "arborists" to perpetuate the historic trees though.
It was, according to the article that around 1970 a fellow named Mcginnis, tired of a favorite oak that had bore the marks of repeated blows by a delivery truck pitched the idea of the critical root zone/tree protection zone.
One foot in diameter for every inch in the tree's girth. (note that back in that era the root zone was thought to be much smaller in dia. than it is known to be now).
The CRZ quickly caught on and it became the standard for operating procedure in cases where trees and concrete meet. (excerpted from Tim Taliaferro's article "The war of the Trees"